1128010 Replacing alternator drive belt (N51)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2011 BMW 328xi, 2011 BMW 328i, 2010 BMW 328xi, 2010 BMW 328i, and 2009 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Aluminium-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminum screws/bolts exclusively.
Aluminum screws/bolts must be replaced each time they are released.
Aluminum screws/bolts are permitted with and without color coding (blue).
For reliable identification:
Aluminum screws/bolts are not magnetic.
Jointing torque and angle of rotation must be observed without fail (risk of damage).

Necessary preliminary tasks:

Remove FAN COWL .
Mark the direction of rotation of the drive belt if it is to be reused.

Layout of drive belt.

Fig 1: Identifying Drive Belt Routing

Courtesy of BMW OF NORTH AMERICA, INC.

Turn belt tensioner (4) in direction of arrow until bore (2) is flush on housing.

Hold belt tensioner (4) under tension.

Fig 2: Turning Belt Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Secure belt tensioner with special tool 11 3 340 .

NOTE: Illustration N42.

Fig 3: Identifying Belt Tensioner And Special Tool (11 3 340)

Courtesy of BMW OF NORTH AMERICA, INC.

Remove drive belt (1) towards top.

Fig 4: Turning Belt Tensioner

Courtesy of BMW OF NORTH AMERICA, INC.

Assemble engine.

Installation:

Check that drive belt for is in correct installation position - risk of damage.